Motorola M68HC08 Reference Manual page 137

Sensorless bldc motor control using the mc68hc908mr32
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6.5.4 Software Customizing to Motor — Voltage and Current Settings
NOTE:
6.5.4.1 Maximal and Minimal Voltage Limits Setting
DRM028 — Rev 0
MOTOROLA
Freescale Semiconductor, Inc.
When the software parameters are set for the hardware, you should
follow the settings in
Current
Settings.
The software parameter settings according to customer motor are
described in this section.
First of all, voltage and current settings need to be done. For settings
which must be done, follow the labels MUST_CHANGE_nn and
MUST_CHANGE_EXPER_nn in file const_cust_x.h where nn = 1.
For changes which can be done (but usually are not necessary), follow
the labels CAN_CHANGE_nn and CAN_CHANGE_EXPER_nn in file
const_cust_x.h
Detailed description starts here.
Most of voltage limit settings do not necessarily need to be done:
Maximal limit of dc-bus voltage [V]:
/* CAN_CHANGE_1: */
#define VOLT_MAX_FAULT_V 380.0
Range: <0,VOLT_RANGE_MAX>
VOLT_MAX_FAULT_V determines the maximal voltage when the
drive fault state should be entered. So, the constants
VOLT_MAX_FAULT_V must be set according to maximal voltage
limit of the motor or the power stage, using the lower value. Therefore,
the setting of this constants is also mentioned in
Hardware Customizing
MUST_IF_HW_CHANGE_3. It should be changed when there are
problems with over-voltage.
Minimal limit of dc-bus voltage [V]:
/* CAN_CHANGE_2_EXPER: */
#define VOLT_MIN_FAULT_V 100.0
Range: <0,VOLT_RANGE_MAX>
User Guide
For More Information On This Product,
Go to: www.freescale.com
Software Customizing to Motor — Voltage and
under a different label
User Guide
Tuning for Customer Motor
Voltage Setting
Designer Reference Manual
137

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